Text

Response to Request for Additional Information Description of the U-bolt, Basket End, Couplings, and Stiffener Qualification Tests
	ML18219D879
Person / Time
Site:	Cook
Issue date:	10/27/1977
From:	Tillinghast J; Indiana Michigan Power Co, (Formerly Indiana & Michigan Power Co)
To:	Case E; Office of Nuclear Reactor Regulation
References
	Download: ML18219D879 (64)
	v • d • e

i DISTRG3UTION AFTER ISSUAN F OPE IATZVG LICENSE

NRC FOAM 1'95 U.*NUC48AR RSOULATQRY CCM

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~uNC~IFISO Mr Edson ao Case PRQP INPUT FORM FROM'ndiana & Michigan Power Company New York, N, Y John Tillinghast C*TE OF OOCUMSNT 10/27/77 OATS ASCSIVSO 11/4/77 NVM88R QF CQPISS R8CSIVSO l Sr448G i <<SSCRIPTION 1

I I

SNCI OSUA8 Consists of info, re NRC's request for info.

rei Westinghouse Elect Corp. WCAP-8887 ~ ~ ~ ~ ~ ~

w/encl'ncluding Ehe Vestinghouse Elec~

Corp'est Plan TP-069 & Test Report ICE-TR-079 "Production Ice Basket Bottom End Assembly Qualification Static 'Zest"

~ ~ ~ notorized 10/27/77 ~ ~ ~ ~ ~

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PLA"IT NNK:

Cook Units 1 & 2 RJL

- 11/4/7.7 SAF" TY I BRANCH CHIEF:

7)

(2-P)

FOR ACi iON/INFO RMATION lE.dc'+98 REG "ILc.

IN I cRNAI. 0 ISTRI BUTION I I C E (")

i OELD I HAIVAUER I CHECK SHAG BUTLER GBZ4ES LPDR:

WTERNAI. OISTRIBUTION CONTROI. NUMBER NSIC 16 CYS ACRS SENT CATEGORY

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KMMOPAfKK/THL< L'OPY INDIANA a MICHIGAN POWER COMPANY P. O. BOX 18 BOWLING GREEN STATION NEW YORK, N. Y. )0004 October 27, 1977 Donald C. Cook Nuclear Plant Units 1 and 2

Docket Nos.

50-315 and 50-316 DPR No.

58 and CPPR No.

61 Mr. Edson G. Case, Acting Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.

20555 aov4 19>~ e l58X gej}'J

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Dear Mr. Case:

This is in response to the July 20, 1977 letter from Mr. Don K. Davis of your staff requesting information regarding Westinghouse Electric Corporation WCAP-8887.

Mr.'avis requested that we provide him either a description of the U-bolt, basket end, couplings, and stiffener qualification tests using the assumptions in WCAP-8887 or justify why the tests previously evaluated by the NRC still apply to the Donald C. Cook Nuclear Plant.

Attached to this letter and in response to Mr.

Davis'uly 20, 1977 letter, is a copy of Westinghouse Electric Corporation Test Plan TP-069 and Test Report ICE-TR-079.

These reports "Production Ice Ba'sket Bottom End Assembly Qualification Static Test, " cover the test qualification of ice basket bottom assembly U-bolts, basket

ends, couplings, and stiffeners.'t is to be noted that the "Test Qualification Loads, " identified on Table I of TP-069, envelope the design loads on Table 4-1 of WCAP-8887, at the top of the Lower Support Structure elevation.

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Mr. E. G. Case October 27, 1977 Therefore, the referenced reports still apply to the Donald C. Cook Nuclear Plant.

Very truly yours, hn Vice Presid s

JT:mam Enc.

Sworn an subscribed to before me on this

'2~

day of October 1977 in New York County, New York Notary Public DAVID G. HUMF NOTARY PUSLIC, Stere of New York No. 31.4608113 Quelified in New York Counfy Commission Expires hherch 301979 cc:

P.

W. Steketee R. Walsh R. J. Vollen R. C. Callen G. Charnoff D. V. Shaller Bridgman R.

W. Jurgensen

REC-.IVER MCli!IF'~~

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ICE-TR-079 I

TEST REPORT:

PRODUCTION ICE BASKET BOTTOM END ASSEMBLY QUALIFICATION STATIC TEST - DOMESTIC PLANTS PREPARED BY:

APPROVED BY:

D. A. Lope, er Ice Condense pment Mechanical Equ ment Engineerin'g mm-Rex&-

sf'J's, an er

. Reactor Coolant ystems Analysis - Mechanical 8

Materials Technology Date:

-7 D te ~ Sf APPROVED BY:

.5J. 4 L.

. Brown, anager guality 5 Reliability Engineering, quality.

.Assurance Date: 9-29-0 APPROVED BY:

eorge, anager Hydraulic 5 Containment Equipment Mechanical Equipment Engineering

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i ICE-TR-079 Page 2

REFERENCES 1.

Test Plan'P-069 - Production Ice Basket Bottom End Assembl Static Test.

D. A. Lopez 7-27-76 ualification 2.

Calculation No. 069 - Ice Basket Load CalcuTations.

AEP/NP - DAP/DBP-DCP/DDP - TVA/TEN - MA HB.

D.

opez 0 6 3.

fO-ACSA-572 - Ice Density Multiplication Factors Cases 1-9.

M. S.

LaPay Feb. 18, 1977

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ICE-TR-079

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1.0 OBJECTIYE The objectives of this ser$ es of tests

$ s 11sted here (there are additional. objectives here that were not stated

$ n the test plan (reference 1).

l.

.. 2.

3a To fulfillthe objectives of Test plan TP-069 (reference 1)

To qualify basket end assemblies attached to baskets of low strength materfal.

To qualify basket end assemblies to loads of ice maldistribution as given

$ n reference 3.

1I The objective of th$ s 'test fs to qualify the basket end assembly only, and not to qualify the internal basket - lattice fram impact sections.

The static test setup of this test, although proved)ng proper loads at the basket end assembly, places the center support region of the basket

$ n load)ng approx)mately 76K higher than the qual)ficat)on test load for this region (see Section 7.0; this report).

The upper basket

'egions are therefore qualified by separate tests.

2.0 TEST ITENS testing.

3.0 TEST CONFIGURATION AND INSTRUMENTATION

'I The test items are as described

$ n reference 1, Section 2.0.

An

'dditional test basket, 83, with a yield strength of 29,600 ps'as also tested.

The U-.bolts (Items 1145E10H15 or 1191E57H15) of all test baskets were torqued to a value of 30.to 35.ft<<lbs prior to

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I i Q The 3nstrumentat$ on and test configuration are as described

$ n reference 1, Sect)on 3.0.

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ICE-TR-079

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4.0 RESULTS 7

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Results of loadings of four test baskets are shown in 'Figures 1

through 4, and given (as raw data in Tables 2 through 7.)

Figures 1 through 4 show combinations of vertical (axial) load (positive being compressive) and the horizontal reaction at the basket end assembly for all tests run.

In all figures, the value of H in the tests were determined from the following formula:

H <<.1.85 (2T + F4 + F5) as explained in reference 1, Appendix B-II.

The vertical loads were read directly from a load cell strain box.

4 S.O TEST QUALIFICATION LOADS C'.

Reference 1, Appendix A gives basic test qualification loads for 378/ft ice and basket weight at even density loading from, reference 2.

These

'loads have been revised and expanded due to the necessity to include

~

maldistribution (reference

3) and single basket test factors (10").

Table 1 provides these revised test qualification load combination

'f V and H, necessary for qualification of various basket loading cases and testing procedures.

From examination of reference 2, page 34, it may be seen that as far as test qualification is concerned, the D + OBE and D + DBE + DBA load cases are envelope to 0 + DBE and D + DBA cases.

The latter two cases are therefore ignored in test qualification.

5

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ICE-TR-079

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I 6.0 DISCUSSION OF RESULTS 6.1 Envelope Test Runs 6.1.1 Tests 1 and 2 The envelope runs of Test 1 and'2 did envelope all loads from test case 1 (Table 1).

These runs are shown in Figures 1 and 2

respectively, The mounting brackets of these baskets

were, however, centered at the nominal center position and therefore the maximum loads may not have been produced.

The data from these two envelope tests is included for completeness, but will therefore not be used for qualification.

6.1.2 Test 3

"I The Test 3 envelope run is given in Figure 3.

(The mounting bracket used for Test 83 was displaced to the maximum position producing the maximum loads).

Figure 3 shows that the maximum D + DBE + DBA loads are X

1095 and V

5641.

These values exceed Test Case 4 values for D + DBE + DBA from Table 3.

. Figure 3 also shows that for D + OBE, at V = 5704 lbs at fl = 944 lbs..

The vertical loads, Y, is in excess of Test Case 4, D + OBE qualification loads (Table 1) by llew, while the horizontal load of 944 lbs. is below the Test Case 4 horizontal qualification load of 963 lbs. by 3X.

During D +'OBE envelope testing the basket of Test 3 incurred a local radial deformation of.6" at 37 1/8" =from the bottom or half way between supports.

This deformation was repaired prior to the failure point run of Test 3 (Section 6.2.3).

None of the envelope test runs produced any permanent deformation of any basket end components or of the basket.in the local vicinity of the basket end assembly.

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ICE-TR-079 Page 6

6.2 Failure Pofnt Runs The baskets of Tests 1 through 4 were. each sub)ected to a "failure point" load.

That 5s, a vertical load was applied and then the horizontal load was increased until fa)lure ensued.

Figure 4 shows the failure point test results of al,l four baskets.

6.2.1 Test 81 The vertical load was increased to 3940 lbs. tension and then the horizontal load was increased to 1721 lbs. at this point, no deformation of a basket end assembly or of the basket

$ n t5e local region of the

= basket end assembly was noticeable.

The test,

however, was stopped to preserve the test fixturfng.

At this point, the horizontal load was

$ n excess of the Test Case 4, 0 + OBE + DBA test qualification load of 1025 lbs. by 68Ã.

II 6.2.2 Test 02 No vertical load was applied and the horizontal load was increased zo 1734 lbs.

Again, no deformation of the basket end assembly or basket local to the assembly was noticeable.

The test was stopped to preserve the test fixturing.

The test load was in excess of the Test Case 4

horizontal qualification load of 1025 lbs. by'9K.

6.2.3 Test N3 The maximum vertical and horizontal loads achieved as the failure point run of the Test 3 basket were 5339 lbs.

and 1176 lbs., respect)vely.

A

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ICE-TR-079

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Page 7

'I a

These, loads are 4X and 22%, respectively above qualification loads for Test Case. 4 of Table.l.

Although the basket failed at three feet from'he bottom when subsequent loads were applied, neither the basket end assembly or. the basket local to the assembly showed any deformatfon.

6.2.4 Test 84 As fn Test 3, the mounting bracket of Test 4 was posftfoned at the maximum off center point.

Test 4 was run to determine a failure point only.

The vertical load was increased to the Test Case 4, D + OBE value from Table 1 of 5133 lbs.

The horizontal load was then applied by a tare weight of 144 lbs. per tare which produces a horizontal load of 1048 lbs. which is greater than the Table 4 test qualification load of 963 lbs.

At this value of H however, the vertical load had dropped to

, approximately'4700 lbs.

The vertical load was slowly fncreased and 5ust prior to reaching 5100 lbs. the basket failed at a point at least three feet away from the basket end assembly.

This basket is considered to'ave qualified the basket end-assembly because"1) when the weight of the test basket is considered, (approxfmately 180 lbs.) the vertical test qualification load was reached,

2) the basket end assembly and the basket local to the assembly showed no signs of deformatfon even after failure of the basket upper regions.

7.0 DISCUSSION ON BASKET FAILURES AS THEY RELATE TO BASKET END ASSEMBLY QUALIFICATION As has been stated, at the time of all basket "failures" fn these test, the actual items being tested showed no signs of even beginning to fail, I

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iCE-V-Ore Page 8

,I 0

though their qualification test loads wire met or nearly met.

/

This "premature" failure of the central basket'test items is due to the excess loading of that region as stated in Section 1.0.

The reason for this excess loading fC.as follows:

The center region of the 12',

2 span beam test basket model failed due to high loads.

and moments as a result of static distribution of load to a evenly loaded 2 span beam.

This may be seen when the load applied to the basket center is compared to the'est qualification loads six feet above the lower support structure (lattice frame 88 position).

When the basket end assembly is loaded to the D + OBE test qualification horizontal load of 963 lbs., this equals (3/8) wl for a evenly loaded 2 span beam (where wl is the weight distributed to each span of the beam).

The reaction, R, at the center support, is, however, equal to (10/8) wl.

This reaction is found as follows

. ~ ~ wl ~ 963 lbs 3

~ I

, wl ~ 8 (963)

Y 10 10 R ~ ~wl ~ (8 )

(~)

963 ~'3210 lbs.

~

I Therefore when the test qualification load of 936 lbs. is applied at the basket end, the basket center support sees 3210 lbs.

From reference l,-page 34 it is seen that 3210 lbs. is in excess of the 6'levation test qualification load by 76K.

1.76 3210

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ICE-TR-079 t

Page 9

In an attempt to accommodate this htgh load condition the test basket center and quarter points were reinforced against radi'al deformation.

Failure, vthen it occurred, however, occurred immediately ad5acent to the quarter point supports.

8.0

'ONCLUSIONS As can be seen in the Figure 4, "failure curve". the test qualification loads were exceeded by a great margin at tensile and zero axial (vertical) basket loads (tests fl 5 d2).

For compressive axial load failure point (tests 83 8 d4).

The test baskets met or nearly met a value 105 above the qualification test load of all ice maldistribution at the L.S.S.

(maximum loads from Table 1).

The 10% figure is necessary by the "Ice Condenser General Design Criteria" when less than three specimens are used for a single test.

By these criteria, "failure point" tests (1,'

and 3) qualify the design outright and test 4 is considered to have shown qualification by reasons stated in Section 6.2.4.

Throughout all testing, no visible deformation of the basket end assemblies, attachments or of the basket local to the end assembly could be seen.

It can be assumed that the end assembly portion of the basket could have taken significantly higher loads than reflected by these tests but that, the u'pper basket portions limited the performance due to their abnormally high loading as explained in Section 7.0.

It is therefore concluded that this test provides full qualification of all domestic ice basket end assembly components for the following cases:

Possible low strength material.

2.

Maldistribution.of ice per Reference 2 and Table 1.

f

TABLE 1-TEST QUALIFICATION LOADS LOAD CASE

' ICE-TR-079

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Page 10 TEST CASE D + OBE D + DBE + DBA 375/ft {Design Case) 378/ft X 1.1 for Single Basket Test Ice italdistribution 2 Cases Ice Haldistribution X 1.1 for Single

. Basket Test.

769 875 963 4666 5133 4666 5133 840 924 932 1025

-3650

>>4015

-3650

-4015 (1)

From Reference 2

(2)

See Appendix A for derivation

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TABLE 1 TEST QUALIFICATION LOADS LOAD CASE ICE-TR-079

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Page 10 D + OBE D + DBF + DBA TEST CASE 374/ft (Design Case) (1) 378/ft X 1.1 for Single Basket Test Ice,'1al di s tribution 2 Cases Ice Maldistribution X 1.1 for Single Basket Test.

769 875 4666 5133 4666 5133 840 924 932 1025 V

-3650

-4015

-3650

-4015 (1)

From Reference 2

(2)

See Appendix A for derivation

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.1 ICE-TR-079

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Page ll

- APPENDIX A I

i-ind the 0'levation horizontal test qualification loads from ice maldistribution from reference 3 for D + OBE and D + DBE + DBA.

,a.

D + OBE The maximum D + OBE loads for 37 lbs/ft from reference 2, page 10 are:.

OBET ~ 296 lbs.,

OBER 407 lbs.

'rom reference 3, Case 8 at the L.S.S.

AFT ~ 1.18,,

HFR

~ 1.15 e

Therefore, the nerd maldistribution loads are:

OBET 296 (1.18)

~ 349 lbs.

. OBER 407 (1.15) 468 lbs.

Naximum design load 468 lbs.

tlaximum test qualification load 468 (1.87) 875 lbs.

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ICE-TR-079 Page 12 b.

D + DBE + DBA i

The maximum DBE loads for 37 lbs/ft from reference 2, page 11 are+

DBEI ~ 407 lbs.,

DBER ~ 519 1bs.

'from reference 3, Case 8, at the L,S,S.

NFT < 1.188 FR 1 ~

Therefore, the new maldfstrfbut<on loads are:

DBEI ~ 407 P.18)

~ 480

. OSE-S19 (1.15' 597 From reference 2, Append)x B )t

$ s seen that at the 0'levation, the maximum D + DBE + DBA horizontal load hs at 45'or the OAP plant.

The new maid)strfbutfon load at 45's found from the equation on page 22 with 1.01 set to 1.0 since maldkstr)button factors are based on 37.0 lbs/ft basket weight.

ICE-TR-079

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'Page 13 D + DBE + GBA t.t'..354 (480 + 697) + 2.1 (79)j

.+I.364 (480 + 597) + 2.1.(39)3 ]

~ 717 lbs.

\\

max)mum design load 717 lbs.

maximum test quail ffcatfon load ~ 717(1.3) 932 lbs.

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TP-069 TEST PLAN'RODUCTION ICE BASKET BOTTOM END.ASSEhBLY QUALIFICATION STATIC TEST PREPARED BY:

P Date:

7-3. >- 76 D.. Lopez, /~Engineer Ice Condenser Equipment Mechanical Equipment Engineering APPROVED BY:

K. N.

ashy,

ran ger

.Reactor Coolant Systems

,r Analysis - Mechanical 5

t'laterials Technology Date:

APPROYED BY:

KJ.

L. R. Brown, llanager Duality 5 Reliability Engineering, Quality Assurance Date:

7-2-V APPROVED.BY:

L. R. Katz, Hanager Ice Condenser Equipment Mechanical Equipment Engineering

~

\\

TEST PLAN - ICE BASKET BOTTOH END ASSEt1BLY QUALIFICATION 1.0 OBJECTIVE Due to an increase in basket end loads, above those given in test plan ICE-TP-043, the original production ice basket test plan, and due to the static distribution of load at,the end of the two span beam model, the ice basket end assembly test reported in MCAP-8110, Supplement 10 does not qualify the basket end assembly.

The object of this test plan is therefore to qualify the ice basket bottom end assembly by testing to the proper test qualification loads* and also testing to failure.

This test will provide test qualification for the following plants:

AEP, AMP, TVA, TEN DAP, DBP,

DCP, DDP, MAT, and MBT.

This test plan ihcludes tests identical in nature to those of the above test report and also includes failure testing.

.r

'.0 TEST ITEtlS Three identical test basket sections will be used for basket end

, qualification (see Figure 1).

The basket shell design will be that of Part fl145E10HOl or 1191Eo7HOl, a

12 foot basket bottom section, except that the material will be ASTN A620 with the following average yield strength based on two samples per basket section:

Basket >1-28,600 psi, Basket 6'2 - 28,700 psi, and Basket P3 - 28,900 psi.

The baskets will be ungalvanized.

Each basket is fitted with a.special top coupling which will facilitate application of axial tension and axial compression of the basket.

Figure 2 shows the top coupling details.

The center basket stiffener ring is of a special design to allow no basket center deformation even under failure loading.

This will ensure that the basket end has the proper portion of the loading throughout the tests.

(see Appendix B-I).

The basket shell, stiffeners and couplings are J

. *See Appendix A for test qualification loads.

I

qual)fied by other tests.

This test is to qualify the bottom end'ttachments only).

Figure 3 shows the center stiffener design.

The bottom end attachments consists of the following items:

1) basket end assembly:

1188E38G01 or 1191E57G04

2) U-bolt:

1145E10H15 or 1191E57H15 3) mounting brackets:

7250D57H01 or 1145E45G03 4) coupling screws 1145E10H19 or 1191E57H09 5) clevis pin 1145ElOH10 or 1191E57H10.

Figure 4 shows the bottom basket assembled configuration, Note all ice basket bottom end assembly parts used in these tests are actual production parts which have been g.A. released.

The basket shells, although of a reduced strength, have been manufactured by production procedures and have production g.A. releases.

3.0 TEST CONFIGURATION 3.1

. Mechanical Each of the three bottom baske't test specimens of Section 2.0 shall be mounted vertically as shown in Figure 5 for combined vertical and horizontal load simulation.

Vertical loading is applied by a hydraulic cylinder fixed to the top coupling.

The horizontal loads are applied using a cable and pulley system, see Figure 5, with internal semi-circular attachment brackets.

The attachment bracket design is shown in Figure 6.

Horizontal distributed loads are induced in the basket when weights are applied to the tares.

Each tare weight is multiplied approximately ten times when applied to the basket by the'pulley systems.

The lower clevis pin attachment test fixture is shown in Figures 7 5 8.

Note that the axial compressive loads are applied 2.9 inches off center to simulate increased basket moments due to possible eccentric loading of upper basket sections.

3.2 Instrumentation

)

3.2.1 All instruments must be in current calibration and traceable to NBS.

3.2.2 thount 5 load cells and two dial indicators as shown in Figure 5.

The load cell and dial indicator numbers in the figure reflect those of the data tables.

Load cell 41 must have a minimum capacity of + 5000 lbs.

Cells

<<2 through 85 must have a minimum capacity of 300 lbs.

The dial indicators should have a 1" range.

4.0 TEST PROCEDURE 4.1 Test 81 (Test Basket bl )

4.1,1 See data

sheet, 81 for required data.

4.1.2 Add' negative vertical (tension) load of -3,700 lbs.

r 4.1.3 Add weights evenly to the tares in increments of 20 lbs. until tare plus weights equal 114" lbs.

Add weights in 5 lb. increments until both the following conditions are met.

(See Appendix B-II for deviation).

1.834 (4T + F2 + F3 + F4 + F5)

> 1680 and 1.834 (2T + F4 + F5) 840 Hhere T is the tare weight'and F2 +

F3 +

F4 + F5, are the readings, in lbs., of the respective load cells.

At this-point, record tare weights, all load cell readings and all dial indicator readings.

t/ote the tare itself is 4 lbs.

and is included in this figure.

1

4.1.4 Decrease the vertical load to zero and take all readings.

4.1.5 Increase the vertical load to + 4700 (axial compression) at 2.9". off center and take all readings.'.1.6 Decrease to horizontal load to zero and take all readings.

4.1.7 Decrease the vertical-loads to zero and take all readings.

Inspect for deformation and report on data sheet.

4.1.8 To obtain a failure curve point, apply a negative vertical load (axial tension) of -3700 lbs.

4.1.9 Increase the tare vieights evenly, until equal to the highest value used in Section 4.2.3, I

I 4.1.10 Increase the tare weights in increments of 20 lbs. or less until the basket can no longer support the vertical load:

Take load cell and indicator readings at each increment.

4.1.11 Remove all loads and take readings.

4.2 Test P'2 (Test Basket 82) 4.2.1 See data sheet b2 for required data.

4.2.2 Repeat 4.2.2 through 4.2.7 for basket P2.

4.2.3 To obtain a failure curve point, remove all vertical load and repeat steps 4.2.10 through 4.2.11 for basket b2.

.4.3 Test 83 (Test Basket 83),

4.3.1 See data sheet 83 for required data.

4.3.2 Repeat 4.2.2 through 4.2.7 for basket 83.

4.3.3 To obtain a failure curve, add a positive vertical load. (compression) of + 4700 lbs.

and repeat steps 4.2.10 through 4.2.11 for basket P3.

5.0 OATA REQUIREt~iENTS The loads and deflections are required as indicated in Section 4.0

'bove.

6.0 ACCEPTANCE CRITERIA The basket end section is qualified provided that the baskets can support the test loads of Sections 4,2.2 through 4.2.7, the qualification test load envelope loads.

~

APPENDIX A TEST QUALIFICATION LOADS The following test qualification loads for the basket bottom lower support structure connection have been obtained from Ice Condenser Engineering calculation IOIOC9, "Ice Basket Load Calculations" dated 10-29-75.

TABLE I Horizontal (H) and Vertical (V) ice basket lattice frame connection qualifi-cation test loads in lbs.

LOAD CASE 769 D + OBE

'666 D + DBA H

V 265

-2527*

D + DBE H

V 749 4065 D+ DBE+ DBA H

V 840

-3650*

Note that D + OBE test loads envelope D + DBE and D + DBE + DBA loads envelope D + DBA loads, therefore only D + OBE and D + DBE + DBA loads are considered.

Test qualification load factors have been applied per "General Ice Condenser Design Criteria" April 24, 1974, Rev, 0, page 28, Table l.

C:

The negative signs indicate axial tension

0 1

/y b

APPENDIX 0 Calculation of required tare weight and load cell readings to produce horizontal test qualification loads at the basket bottom assembly.

Obtain the.basket end reaction as a function of load distribution..

In order to achieve the horizontal test qualification.load, H, at the basket bottom of the test section, the two span beam model is used see Figure 9.

It is seen that for a load of ~L, (~ is the distributed load per unit length) the bottom reaction H, is H = o)L 3

8 or toL H

8 3

II.

Calculation of tare weights necessary to produce the horizontal test qualification load H, in the test section.

Figure 5 shows the pulley system of the test.

For the entire basket length, the entire

load, MTOT, applied is given by:

TOT 24 L = (4T + F2 + F3 + F4 + F5)

(10)

(COS 12')

Substituting gL"-8H 3

From Appendix A-1 into the above, and rearranging, 2

H = 3 (4T + F2 + F3 + F4 + F5)

(5)

(COS 12')

8 org 2H>1.034 (4T+F2+

3

)

Since H is equal to 840 lbs. at test qualification, I

1.834 (4T + F2 + F3 F4 F5)

= 1680 lbs.

Similarily, for the basket lower section, Equation (1)

'ML ~ (2T + F4 + F5

) (10)

(COS 12')

2 Since uL =

3 H, 8

3 H = (2T + F4 + F5)

(10)

(COS 12')

2 or 1.834 (2T + F4 + F5)

= 840 lbs.

Equation (2)

Mhen these two conditions are met, the end load should equal the test qualification load.

Note:

the value Cos 12's due to the 12'ngle that the pulley cable form with respect to the horizontal direction (see Figure 5).

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